function Checking () {
    this.balance = amount
    this.depost = depost
    this.withdraw = withdraw
    this.toString = toString
}

function depost (amount) {
    this.balance += amount
}

function withdraw (amount) {
    if (amount <= this.balance) {
        this.balance -= amount
    }
    if (amount > this.balance) {
        console.log('Insufficient funds')
    }
}

function toString () {
    return 'Balance' + this.balance
}

